I use Telegrams. For me, this is the most convenient social network in all respects, because it is very safe. And I know here a lot of competent investors in cryptocurrency who share their experience of investing. This has a positive effect on the spread of bitcoin, I think.
In my opinion social media is a very powerful tool for promoting crypto, because it is used by users all over the world.
In many successful promotions on social media, because the similarity of ideas, hobbies or communities makes it the best marketing place.